Exam Questions

Practice & Scenarios

Load Balancer Questions

Question 1

Which load balancer supports WebSocket connections?

Answer: Application Load Balancer (ALB)

Question 2

Gaming application needs ultra-low latency. Which ELB?

Answer: Network Load Balancer (NLB)

Question 3

Route traffic based on HTTP headers?

Answer: ALB with listener rules

Auto Scaling Questions

Question 4

Best scaling policy for maintaining 70% CPU?

Answer: Target tracking scaling policy

Question 5

Prevent rapid scaling events?

Answer: Configure cooldown periods

Question 6

Scale based on predictable traffic patterns?

Answer: Scheduled scaling actions

Multi-AZ & High Availability Questions

Question 7

RDS Multi-AZ failover time?

Answer:

60-120 seconds automatic failover

Question 8

Distribute ASG instances across AZs?

Answer:

ASG automatically distributes instances evenly

Health Check Scenarios

Question 9

ELB vs EC2 health checks for web apps?

Answer: ELB health checks are more comprehensive

Question 10

Health check grace period purpose?

Answer: Allow time for instance initialization

Question 11

Custom health check endpoint?

Answer: Configure health check path in target group

Architecture Questions

Question 12

Stateless application design benefit?

Answer: Enables horizontal scaling

Question 13

Store session data for scalable web app?

Answer: ElastiCache or DynamoDB

Question 14

Loose coupling between tiers?

Answer: Use SQS, SNS, or API Gateway

Scenario-Based Questions

Scenario 1: E-commerce Peak Traffic

Black Friday traffic expected to increase 10x. How to prepare?

Solution:

  • • Pre-warm ELB and request capacity increase
  • • Configure predictive scaling
  • • Use CloudFront for static content
  • • Implement database read replicas

Scenario 2: Multi-Region DR

Design disaster recovery across regions with 4-hour RTO.

Solution:

  • • Route 53 health checks for failover
  • • Cross-region RDS read replicas
  • • AMI copying to DR region
  • • Infrastructure as Code for quick deployment

Key HA & Scalability Exam Concepts

  • • ALB for HTTP/HTTPS with advanced routing, NLB for TCP/UDP with ultra-high performance
  • • Target tracking scaling maintains specific metric targets automatically
  • • Multi-AZ deployments provide high availability, not performance improvement
  • • ELB health checks are more comprehensive than EC2 health checks for applications
  • • Design stateless applications with external session storage for horizontal scaling
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